Prosecution Insights
Last updated: April 17, 2026
Application No. 18/571,751

Pressure-Differential Engine Apparatus

Non-Final OA §101
Filed
Dec 19, 2023
Examiner
LARGI, MATTHEW THOMAS
Art Unit
3746
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
unknown
OA Round
1 (Non-Final)
77%
Grant Probability
Favorable
1-2
OA Rounds
2y 7m
To Grant
93%
With Interview

Examiner Intelligence

Grants 77% — above average
77%
Career Allow Rate
521 granted / 678 resolved
+6.8% vs TC avg
Strong +16% interview lift
Without
With
+15.8%
Interview Lift
resolved cases with interview
Typical timeline
2y 7m
Avg Prosecution
32 currently pending
Career history
710
Total Applications
across all art units

Statute-Specific Performance

§101
3.4%
-36.6% vs TC avg
§103
46.3%
+6.3% vs TC avg
§102
26.6%
-13.4% vs TC avg
§112
20.8%
-19.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 678 resolved cases

Office Action

§101
DETAILED ACTION Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Claim Objections Claims 2-23 are objected to because of the following informalities: In claims 2-23, each respectively, line 1 should read in part “[[A]] The pressure-differential engine”. Appropriate correction is required. Claim Rejections - 35 USC § 101 35 U.S.C. 101 reads as follows: Whoever invents or discovers any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof, may obtain a patent therefor, subject to the conditions and requirements of this title. Claims 1-23 are rejected under 35 U.S.C. 101 because the disclosed invention is inoperative and therefore lacks utility; the claimed invention is not supported by either a credible asserted utility or a well-established utility. The instant application claims to create more usable power than it consumes, which is in direct conflict with the first law of thermodynamics, a law of nature. This is the law of conservation of energy, which simply states that energy can neither be created nor destroyed. The claimed invention attempts to create energy through perpetual motion using pressure differential and gravitational pull as a source of continuous free clean energy. (See Applicant’s specification, Paragraph [006]). Specifically, the claimed invention of the instant application generates energy from pressure differential forces and gravitational forces without any external driving force, thus violating the first law of thermodynamics and rendering the device inoperable. Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. Frank, Kusmer, Daya, Tait, Ramsundar, Boyd, Kim, Holmevik, Manoj, Frank’496, and Memis show. Any inquiry concerning this communication or earlier communications from the examiner should be directed to MATTHEW THOMAS LARGI whose telephone number is (571)270-3512. The examiner can normally be reached 8:00 - 4:00 M-F. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Essama Omgba can be reached at (469) 295-9278. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /MATTHEW T LARGI/Primary Examiner, Art Unit 3746
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Prosecution Timeline

Dec 19, 2023
Application Filed
Oct 17, 2025
Non-Final Rejection — §101 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12595757
ENGINE CONTROL SYSTEM INCLUDING DUAL CONTINUOUS VARIABLE VALVE DURATION DEVICE AND GPF FORCED REGENERATION METHOD USING THE ENGINE CONTROL SYSTEM
2y 5m to grant Granted Apr 07, 2026
Patent 12590574
POWDER SUPPLY PUMP
2y 5m to grant Granted Mar 31, 2026
Patent 12586691
NETWORK AND INFORMATION SYSTEMS AND METHODS FOR SHIPYARD MANUFACTURED AND OCEAN DELIVERED NUCLEAR PLATFORM
2y 5m to grant Granted Mar 24, 2026
Patent 12584659
CERAMIC PARTICLES FOR USE IN A SOLAR POWER TOWER
2y 5m to grant Granted Mar 24, 2026
Patent 12571310
POWER SYSTEM WITH CARBON DIOXIDE WORKING FLUID, GENERATOR, AND PROPULSION SYSTEM
2y 5m to grant Granted Mar 10, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

1-2
Expected OA Rounds
77%
Grant Probability
93%
With Interview (+15.8%)
2y 7m
Median Time to Grant
Low
PTA Risk
Based on 678 resolved cases by this examiner. Grant probability derived from career allow rate.

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